AirHint found the following cheapest return flights from Portland (PDX) to Lisbon (LIS) in April 2026 (see full year).

Return flights

25 Apr - 08 May	Lufthansa
07 Apr - 14 Apr	Air France
08 Apr - 15 Apr	Delta
13 Apr - 20 Apr	KLM
21 Apr - 28 Apr	Delta
22 Apr - 29 Apr	Delta
27 Apr - 04 May	KLM
28 Apr - 05 May	United
06 Apr - 13 Apr	Finnair
14 Apr - 21 Apr	United
01 Apr - 08 Apr	Finnair
26 Apr - 04 May	Air Canada
21 Apr - 16 May	Air Canada
25 Apr - 16 May	Air Canada
05 Apr - 12 Apr	Delta
12 Apr - 19 Apr	KLM
24 Apr - 01 May	United
26 Apr - 03 May	British Airways
30 Apr - 07 May	United
25 Apr - 02 May	Delta

Also check the deals for one-way flights from Portland to Lisbon in April.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Portland to Lisbon in April from $560

Return flights